Test: Ohm’S Law

5 Questions MCQ Test Physics Class 12 | Test: Ohm’S Law

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V-I graph of which material shows the straight line


Materials which obeys the ohm’s law show straight line in the V-I graph. Since silver is the only ohmic material in given options, it shows straight line curve.


The following fig. shows I-V graph for a given metallic wire at two temperatures T1and T2.Then,


The slope of the graph = I / V

In case of T2, I/V is less. Hence, V/I (=R) is more.

Value of resistance increases with increasing temperature. 

Hence, T2 >T


How many electrons are flowing per second through a section of a conductor corresponding to current of 1A?​


1 Ampere = 1 Coulomb /1 Secon
Charge on 1 electron = 1.6 x 10^-19
By unitary method,
If 1.6 x 10^-19 Coulomb / Second (Ampere) = Current by 1 electron
then, 1( Coulomb / Second) or (Ampere) = 1 / (1.6 x 10^-19) electrons
i.e, 6.25 x 10^18 electrons.


1 ohm is equal to


1 Ohm is defined as the resistance of a conductor with a potential difference of 1 volt applied to the ends through which 1-ampere current flows.
Ohms is the SI unit of electrical resistance.


Which of the following is an ohmic conductor?


Ohmic conductors are those which follows ohm's Law

Constantan is an copper nickle alloy which follows ohm's law 

An electrolyte is a chemical that produces an electrically conducting solution and hence conducts electrical current.

But Electrolyte can be  Ohmic as well as non-ohmic conductor

Transistor is semi-conductor device and does not follow ohm's Law

thermionic valves  - is vacuum tube (electronic tube) , uses ion emission.

So option C Constanton s an ohmic conductor.

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